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Tread for heavy-vehicle tire in which the central ribs are provided with inclined incisions

  • US 5,896,905 A
  • Filed: 05/02/1995
  • Issued: 04/27/1999
  • Est. Priority Date: 02/22/1989
  • Status: Expired due to Term
First Claim
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1. A radial tire mounted on a non-driving axle of a medium or high load transport vehicle traveling long distances at sustained speed, with a prescribed direction of rotation in the forward direction of the vehicle, said tire having an operating pressure of inflation greater than 5 bars and embodying a radial carcass reinforcement surmounted by a crown reinforcement with a tread therearound, said tire comprising circumferential grooves in the tread defining at least five ribs between opposite tread edges, the transverse radius of curvature (RT) of such tread in its axial portion, contained between the two axially outermost grooves, being at least equal to 50% of the equatorial radius of curvature (RE) of the tire mounted on its nominal operating rim and inflated to the recommend pressure, incisions formed in one or more ribs of the tread, and every incision having a width other than zero and less than 3 millimeters and opening into each of the two adjacent grooves defining said rib, said incisions extending transversely of said rib substantially parallel to one another and being spaced circumferentially with a pitch between 0.005 and 0.013 times the circumferential length of the tire measured in the equatorial plane, and all of said incisions being inclined by an angle of between 5°

  • and 25°

    with respect to the direction perpendicular to the tread in a direction of inclination which is opposite to the prescribed forward direction of rotation of the tire, whereby the resultant braking force (FF) exerted by the ground on the area of contact of the tire when operating on the non-driving axle tends to straighten the incisions towards a lesser angle of inclination with respect to said perpendicular to the tread and means on the tire for indicating the direction of rotation of the tire in operation on the non-driving axle for moving the vehicle in the forward direction, whereby said indicating means ensures the proper mounting of the radial tire on the non-driving axle.

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